/* body {
  width: 90%;
  max-width: 900px;
  margin: 0 auto;
}

p {
  line-height: 2;
  word-spacing: 0.1rem;
}

img {
  float: right;
  margin-left: 30px;
}

/* 首字下沉 */

/* p::first-line {
  text-transform: uppercase;
}

p::first-letter {
  font-size: 3em;
  border: 1px solid black;
  background: red;
  float: left;
  padding: 2px;
  margin-right: 4px;
}  */

/* 多列浮动 */
* {
  box-sizing: border-box;
}

body {
  width: 90%;
  max-width: 900px;
  margin: 0 auto;
}

div:nth-of-type(1) {
  width: 36%;
  float: left;
}

div:nth-of-type(2) {
  width: 30%;
  float: left;
  margin-left: 4%;
}

div:nth-of-type(3) {
  width: 26%;
  float: right;
}

.clearfix {
  clear: both;
}

footer {
  margin-top: 4%;
}

.column,
footer {
  padding: 1%;
  border: 2px solid black;
  background-color: red;
}